diff --git a/add_mesh_ant_landscape.py b/add_mesh_ant_landscape.py
index c3aeb866cd234014514bd09644dbe0fbb4409fdd..52c28569482a561ec8691bfa1d22409457987cca 100644
--- a/add_mesh_ant_landscape.py
+++ b/add_mesh_ant_landscape.py
@@ -781,7 +781,7 @@ class landscape_add(bpy.types.Operator):
             # sphere, remove doubles
             if self.SphereMesh !=0:
                 bpy.ops.object.mode_set(mode='EDIT')
-                bpy.ops.mesh.remove_doubles(mergedist=0.0001)
+                bpy.ops.mesh.remove_doubles(threshold=0.0001)
                 bpy.ops.object.mode_set(mode='OBJECT')
 
             # Shade smooth
diff --git a/io_import_scene_dxf.py b/io_import_scene_dxf.py
index 87cdd51e5203e60d07d8bd47c7d93a6f84cfbd89..f0cc671e24968915e66bdf2d4cc567c8265c23c1 100644
--- a/io_import_scene_dxf.py
+++ b/io_import_scene_dxf.py
@@ -2376,7 +2376,7 @@ def removeDoubles(ob):
         scn = bpy.context.scene
         scn.objects.active = ob
         bpy.ops.object.mode_set(mode='EDIT')
-        bpy.ops.mesh.remove_doubles(mergedist=theMergeLimit)
+        bpy.ops.mesh.remove_doubles(threshold=theMergeLimit)
         bpy.ops.object.mode_set(mode='OBJECT')
 
 
diff --git a/mesh_bsurfaces.py b/mesh_bsurfaces.py
index a107f661875f3bcc7282087034fd37cd55e1d9c7..2f33ed67b8a517db7a0fcefc6428d49dd7e25bcf 100644
--- a/mesh_bsurfaces.py
+++ b/mesh_bsurfaces.py
@@ -789,7 +789,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
         
         #### Perform "Remove Doubles" to weld all the disconnected verts
         bpy.ops.object.mode_set('INVOKE_REGION_WIN', mode='EDIT')
-        bpy.ops.mesh.remove_doubles(mergedist = 0.0001)
+        bpy.ops.mesh.remove_doubles(threshold=0.0001)
         
         bpy.ops.object.mode_set('INVOKE_REGION_WIN', mode='OBJECT')
         
@@ -1082,7 +1082,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
             # Find "intersection-nodes".
             bpy.ops.object.editmode_toggle('INVOKE_REGION_WIN')
             bpy.ops.mesh.select_all('INVOKE_REGION_WIN', action='SELECT')
-            bpy.ops.mesh.remove_doubles('INVOKE_REGION_WIN', mergedist=self.crosshatch_merge_distance)
+            bpy.ops.mesh.remove_doubles('INVOKE_REGION_WIN', threshold=self.crosshatch_merge_distance)
             bpy.ops.mesh.select_all('INVOKE_REGION_WIN', action='DESELECT')
             bpy.ops.object.editmode_toggle('INVOKE_REGION_WIN')
             
@@ -1114,7 +1114,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
             bpy.ops.mesh.select_all('INVOKE_REGION_WIN', action='SELECT')
             
             # Remove doubles to discard very near verts from calculations of distance.
-            bpy.ops.mesh.remove_doubles('INVOKE_REGION_WIN', mergedist=self.crosshatch_merge_distance * 4)
+            bpy.ops.mesh.remove_doubles('INVOKE_REGION_WIN', threshold=self.crosshatch_merge_distance * 4.0)
             bpy.ops.object.editmode_toggle('INVOKE_REGION_WIN')
             
             # Get all coords of the resulting nodes.
@@ -1420,7 +1420,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
         
         bpy.ops.object.editmode_toggle('INVOKE_REGION_WIN')
         bpy.ops.mesh.select_all('INVOKE_REGION_WIN', action='SELECT')
-        bpy.ops.mesh.remove_doubles('INVOKE_REGION_WIN', mergedist=average_edge_length / 15)
+        bpy.ops.mesh.remove_doubles('INVOKE_REGION_WIN', threshold=average_edge_length / 15.0)
         bpy.ops.object.editmode_toggle('INVOKE_REGION_WIN')
         
         final_points_ob = bpy.context.scene.objects.active
@@ -1703,7 +1703,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
         bpy.ops.object.editmode_toggle('INVOKE_REGION_WIN')
         # Perform Remove doubles to merge verts.
         if not (self.automatic_join == False and self.main_object_selected_verts_count == 0):
-            bpy.ops.mesh.remove_doubles(mergedist=0.0001)
+            bpy.ops.mesh.remove_doubles(threshold=0.0001)
         
         bpy.ops.mesh.select_all(action='DESELECT')
         
@@ -2850,7 +2850,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
         
         bpy.ops.object.editmode_toggle('INVOKE_REGION_WIN')
         
-        bpy.ops.mesh.remove_doubles('INVOKE_REGION_WIN', mergedist=0.0001)
+        bpy.ops.mesh.remove_doubles('INVOKE_REGION_WIN', threshold=0.0001)
         bpy.ops.mesh.normals_make_consistent('INVOKE_REGION_WIN', inside=False)
         bpy.ops.mesh.select_all('INVOKE_REGION_WIN', action='DESELECT')